Advanced accelerometer/gradiometer concepts based on atom interferometry
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1 Advanced accelerometer/gradiometer concepts based on atom interferometry Malte Schmidt, Alexander Senger, Matthias Hauth, Sebastian Grede, Christian Freier, Achim Peters Humboldt-Universität zu Berlin AG Optische Metrologie
2 Outline - Introduction to inertial sensors based on atom interferometry - Potential benefits of gravity sensors in space based on A.I. - Current technology status and ongoing work on mobile interferometers
3 Graphics by IQO Hannover Inertial Sensors based on Atom Interferometry Interferometry Sequence Input: Laser-cooled cloud of ultra-cold atoms (e.g. Rubidium) Using pulses of laser light as mirrors and beamsplitters φ 1 φ 2 φ 3 π/2 π π/2 External contributions to phase difference Δφ Acceleration term Rotation term Population of excited state after pulse sequence
4 Inertial Sensors based on Atom Interferometry Gyroscope and Gravimeter Gyroscope - Two atomic clouds launched simultaneously in opposing directions - Raman beams perpendicular to atomic propagation - Differential measurement Gravimeter - One atomic cloud launched upwards (fountain) - Raman beams parallel to atomic propagation - No enclosed area Δφ rot = 0 Δφ acc = 0 Measurement of Ω Measurement of g External contributions to phase difference Δφ Acceleration term Rotation term
5 Inertial Sensors based on Atom Interferometry Some (of many) existing laboratory-based setups Stanford Gravimeter Florence Gradiometer Hannover Gyroscope Best (published!) results for laboratory experiments: g (absolute accuracy), 4 E/sqrt(Hz) (gradient)
6 Gravity sensors in space: Benefits of atom interferometry Gravimetric sensors based on atom interferometry do not suffer from - Bias problems - Signal and scale factor drifts - Mechanical vibrations (in gradiometry) Sensitivity of an atom interferometer: Decrease Δg by Increasing wavevector k eff (larger area needed) Increasing time T (going into space, using colder atoms i.e. BEC) Increasing atom number N (high-power loading MOTs needed)
7 Gravity sensors in space: Benefits of atom interferometry GOCE gradient spectrum vs. Atom interferometry Data courtesy of Prof. J. Müller
8 Gravity sensors in space: Benefits of atom interferometry GOCE gradient spectrum vs. Atom interferometry Data courtesy of Prof. J. Müller
9 Gravity sensors in space: Benefits of atom interferometry Conclusion: When employing atom interferometry on gravity satellite missions, - lower orbits are possible Higher spatial resolution - a broader frequency range is observable by one single satellite Higher temporal resolution - signal sensitivity would be better than on current missions Higher precision
10 Gravity sensors in space: Benefits of atom interferometry Possible mission scenarios Candidate Concept 1 Single satellite (GOCE-like) using Mach-Zehnder interferometry, 3-axis Conceivable sensitivity: ms T=10s, SNR=1000: s -2 Hz -1/2 (=1 me Hz -1/2 baseline=1m Optional: Multi-photon transitions for high k eff Technology already demonstrated outside of lab environment, possible to measure complete gravity gradient tensor plus absolute value No calibration problems Only moderate sensitivity gain with respect to convential methods Candidate Concept 2 Multiple ultra-compact satellites, size of approximately one soda bottle each Using entangled ensembles as sources, Heisenberglimited detection and other advanced concepts Conceivable sensitivity: ms T=10s, SNR=1000:1 Gradiometric sensitivity probably not limited by atom interferometer but by mission complexity (i.e. eqiuvalent to GRACE follow-up mission employing LISA technology) Possible to measure complete gravity gradient tensor plus absolute value at very high sensitivity No calibration problems Technology still in development Improved sensor performance might not fully translate into improved mission performance (i.e. limited by system complexity issues)
11 Current work on mobile atom interferometers The challenge: Fit laboratory experiment...
12 Current work on mobile atom interferometers...into transportable (and robust!) setup
13 Current work on mobile atom interferometers Miniaturized laser systems Spectroscopy-stabilized laser 27cm Custom-made optical mounts
14 Current work on mobile atom interferometers Next-generation miniaturized laser sources Optical amplifier Micro lens DFB laser source Micro optical bench: 13 x 4 x 1 mm³
15 Current work on mobile atom interferometers Mobile atom interferometer: GAIN (earth-bound) Laser Systems, Electronics, Computer, Diagnostics Vacuum chamber
16 Current work on mobile atom interferometers Mobile atom interferometer: GAIN (earth-bound) First laser system environmental test Compact: three ~ 1 m 3 Modules (interferometers assembly + two 19 racks for laser system and electronics) Robust: critical components based on technology developed for the high g-loads in drop tower experiments Mobile: designed to be truckable and for use at a variety of interesting locations Targeted sensitivity: g / sqrt(hz) at a SNR of 300:1 (intrinsic noise only) g / sqrt(hz) at a SNR of 30:1 (under realistic vibration conditions) Targeted absolute accuracy: g
17 Current work on mobile atom interferometers Drop-tower project: QUANTUS Goal: To create a platform for ultra-cold atom experiments in a microgravity environment 4.7 s of microgravity (catapult configuration: 9 s) Current status: 160 Bose-Einstein Condensates in microgravity created, expansion time of 1s! Next steps: Interferometry applications in freefall DLR project 50 WM 0839
18 Current work on mobile atom interferometers Drop-tower project: QUANTUS 2012/13: Technology demonstration first launch of cold atoms! DLR project 50 WM 0839
19 Current work on mobile atom interferometers Space Atom Interferometer (SAI) Goals: - To demonstrate the possibility of a space-compatible atom interferometer sensor - Build a sensor and test it at system and subsystem level Status: - Vacuum chamber components and laser systems built, assembly begun - Design drop-tower compatible
20 Current work on mobile atom interferometers Some further mobile cold atom experiments ICE project (SYRTE, ONERA, IOTA): Cold atom experiments on parabolic flights and Eur. Phys. J. D 53, (2009) M. Kasevich gradiometric sensor projects DARPA financed Achieved bias stability <10-10 g
21 Summary - Employing atom interferometry on satellite gravity missions offers significant improvements in resolution and precision - Sensitivities could potentially reach dimensions of ms -2 or well below 1 me in space - Efforts are well underway towards mobile and spaceoptimized setups
22
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